title: Anisotropic electron spin resonance of Y bIr₂Si₂.
abstract: A series of electron spin resonance (ESR) experiments were performed on a single crystal of the heavy fermion metal Y bIr₂Si₂ to map out the anisotropy of the ESR-intensity I(ESR) which is governed by the microwave field component of the g-factor. The temperature dependencies of I(ESR)(T) and g(T) were measured for different orientations and compared within the range 2.6 K ≤ T ≤ 16 K. The analysis of the intensity dependence on the crystal orientation with respect to both the direction of the microwave field and the static magnetic field revealed remarkable features: the intensity variation with respect to the direction of the microwave field was found to be one order of magnitude smaller than expected from the g-factor anisotropy. Furthermore, we observed a weak basal plane anisotropy of the ESR parameters which we interpret to be an intrinsic sample property.
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Dresden, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Gruner
authors.forename: J
authors.initials: J
authors.lastname: Wykhoff
authors.forename: J
authors.initials: J
authors.lastname: Sichelschmidt
authors.forename: C
authors.initials: C
authors.lastname: Krellner
authors.forename: C
authors.initials: C
authors.lastname: Geibel
authors.forename: F
authors.initials: F
authors.lastname: Steglich